Part of the instructions on the manual is to download the app which is no longer available.....
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
Try the process in this article:
https://help.fitbit.com/articles/en_US/Help_article/2251.htm
You can download the software at the following link "Download for Windows"
https://www.fitbit.com/start?platform=win
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